arande2
100+ Head-Fier
- Joined
- Jan 15, 2008
- Posts
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Hello I just measured the output of my A/V Receiver's headphone jack.
I don't have a good way to measure current, so I could only measure voltage. I would guess that the voltage capability drops at higher current levels.
First, I should state that I got a max voltage of .6 volts AC from my portable radio.
So.. I played a sine wave through the output of the headphone jack. At first, I kept it low. The first measurement was around 1.5v, not too high. Then I turned it up a few dB, a little over 3v. I started wondering how far it would go.
I turned it up 20dB, 30v. At this point, I was confused. 30v? So I turned it up to find a max reading of a little over 49 volts. I should note that past 40 volts, the measurement kept going down to 0v suddenly after about a second. I assume it's the internal protection circuitry.
49 volts? Why would it be able to put out 49v, even into the high impedance of a meter? What's a good way to get a more useful measurement?
One last question: Is it normal for headphone outputs on Hi-Fi Equipment to be able to put out such a high voltage?
Thanks much! I am eager to learn.
I don't have a good way to measure current, so I could only measure voltage. I would guess that the voltage capability drops at higher current levels.
First, I should state that I got a max voltage of .6 volts AC from my portable radio.
So.. I played a sine wave through the output of the headphone jack. At first, I kept it low. The first measurement was around 1.5v, not too high. Then I turned it up a few dB, a little over 3v. I started wondering how far it would go.
I turned it up 20dB, 30v. At this point, I was confused. 30v? So I turned it up to find a max reading of a little over 49 volts. I should note that past 40 volts, the measurement kept going down to 0v suddenly after about a second. I assume it's the internal protection circuitry.
49 volts? Why would it be able to put out 49v, even into the high impedance of a meter? What's a good way to get a more useful measurement?
One last question: Is it normal for headphone outputs on Hi-Fi Equipment to be able to put out such a high voltage?
Thanks much! I am eager to learn.